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Informations about the package vwo-fme-php-sdk
VWO Feature Management and Experimentation SDK for PHP
Overview
The VWO Feature Management and Experimentation SDK (VWO FME Php SDK) enables php developers to integrate feature flagging and experimentation into their applications. This SDK provides full control over feature rollout, A/B testing, and event tracking, allowing teams to manage features dynamically and gain insights into user behavior.
Requirements
- PHP 7.0 and onwards
Installation
Install the latest version with
Basic Usage Example
The following example demonstrates initializing the SDK with a VWO account ID and SDK key, setting a user context, checking if a feature flag is enabled, and tracking a custom event.
Advanced Configuration Options
To customize the SDK further, additional parameters can be passed to the init() API. Here's a table describing each option:
| Parameter | Description | Required | Type | Example |
|---|---|---|---|---|
sdkKey |
SDK key corresponding to the specific environment to initialize the VWO SDK Client. You can get this key from VWO Application. | Yes | string | '32-alpha-numeric-sdk-key' |
accountId |
VWO Account ID for authentication. | Yes | string | '123456' |
pollInterval |
Time interval for fetching updates from VWO servers (in milliseconds). | No | integer | 60000 |
gatewayService |
An object representing configuration for integrating VWO Gateway Service. | No | array | see Gateway section |
storage |
Custom storage connector for persisting user decisions and campaign data. | No | array | See Storage section |
logger |
Toggle log levels for more insights or for debugging purposes. You can also customize your own transport in order to have better control over log messages. | No | array | See Logger section |
Refer to the official VWO documentation for additional parameter details.
User Context
The context array uniquely identifies users and is crucial for consistent feature rollouts. A typical context includes an id for identifying the user. It can also include other attributes that can be used for targeting and segmentation, such as customVariables, userAgent and ipAddress.
Parameters Table
The following table explains all the parameters in the context array:
| Parameter | Description | Required | Type | Example |
|---|---|---|---|---|
id |
Unique identifier for the user. | Yes | string | 'unique_user_id' |
customVariables |
Custom attributes for targeting. | No | array | ['age' => 25, 'location' => 'US'] |
userAgent |
User agent string for identifying the user's browser and operating system. | No | string | 'Mozilla/5.0 ... Safari/537.36' |
ipAddress |
IP address of the user. | No | string | '1.1.1.1' |
Example
Basic Feature Flagging
Feature Flags serve as the foundation for all testing, personalization, and rollout rules within FME.
To implement a feature flag, first use the getFlag API to retrieve the flag configuration.
The getFlag API provides a simple way to check if a feature is enabled for a specific user and access its variables. It returns a feature flag object that contains methods for checking the feature's status and retrieving any associated variables.
| Parameter | Description | Required | Type | Example |
|---|---|---|---|---|
featureKey |
Unique identifier of the feature flag | Yes | string | 'new_checkout' |
context |
Array containing user identification and contextual information | Yes | array | ['id' => 'user_123'] |
Example usage:
Custom Event Tracking
Feature flags can be enhanced with connected metrics to track key performance indicators (KPIs) for your features. These metrics help measure the effectiveness of your testing rules by comparing control versus variation performance, and evaluate the impact of personalization and rollout campaigns. Use the trackEvent API to track custom events like conversions, user interactions, and other important metrics:
| Parameter | Description | Required | Type | Example |
|---|---|---|---|---|
eventName |
Name of the event you want to track | Yes | string | 'purchase_completed' |
context |
Array containing user identification and contextual information | Yes | array | ['id' => 'user_123'] |
eventProperties |
Additional properties/metadata associated with the event | No | array | ['amount' => 49.99] |
Example usage:
See Tracking Conversions documentation for more information.
Pushing Attributes
User attributes provide rich contextual information about users, enabling powerful personalization. The setAttribute method provides a simple way to associate these attributes with users in VWO for advanced segmentation. Here's what you need to know about the method parameters:
| Parameter | Description | Required | Type | Example |
|---|---|---|---|---|
attributeKey |
The unique identifier/name of the attribute you want to set | Yes | string | 'plan_type' |
attributeValue |
The value to be assigned to the attribute | Yes | string/int/boolean | 'premium', 25, true |
context |
Array containing user identification and contextual information | Yes | array | ['id' => 'user_123'] |
Example usage:
Or
See Pushing Attributes documentation for additional information.
Polling Interval Adjustment
The pollInterval is an optional parameter that allows the SDK to automatically fetch and update settings from the VWO server at specified intervals. Setting this parameter ensures your application always uses the latest configuration.
Gateway
The VWO FME Gateway Service is an optional but powerful component that enhances VWO's Feature Management and Experimentation (FME) SDKs. It acts as a critical intermediary for pre-segmentation capabilities based on user location and user agent (UA). By deploying this service within your infrastructure, you benefit from minimal latency and strengthened security for all FME operations.
Why Use a Gateway?
The Gateway Service is required in the following scenarios:
- When using pre-segmentation features based on user location or user agent.
- For applications requiring advanced targeting capabilities.
- It's mandatory when using any thin-client SDK (e.g., Go).
How to Use the Gateway
The gateway can be customized by passing the gatewayService parameter in the init configuration.
Refer to the Gateway Documentation for further details.
Storage
The SDK operates in a stateless mode by default, meaning each getFlag call triggers a fresh evaluation of the flag against the current user context.
To optimize performance and maintain consistency, you can implement a custom storage mechanism by passing a storage parameter during initialization. This allows you to persist feature flag decisions in your preferred database system (like Redis, MongoDB, or any other data store).
Key benefits of implementing storage:
- Improved performance by caching decisions
- Consistent user experience across sessions
- Reduced load on your application
The storage mechanism ensures that once a decision is made for a user, it remains consistent even if campaign settings are modified in the VWO Application. This is particularly useful for maintaining a stable user experience during A/B tests and feature rollouts.
Logger
VWO by default logs all ERROR level messages to your server console.
To gain more control over VWO's logging behaviour, you can use the logger parameter in the init configuration.
| Parameter | Description | Required | Type | Example |
|---|---|---|---|---|
level |
Log level to control verbosity of logs | Yes | string | 'DEBUG' |
prefix |
Custom prefix for log messages | No | string | 'CUSTOM LOG PREFIX' |
transport |
Custom logger implementation | No | array | See example below |
Example 1: Set log level to control verbosity of logs
Example 2: Add custom prefix to log messages for easier identification
Example 3: Implement custom transport to handle logs your way
The transport parameter allows you to implement custom logging behavior by providing your own logging functions. You can define handlers for different log levels (debug, info, warn, error, trace) to process log messages according to your needs.
For example, you could:
- Send logs to a third-party logging service
- Write logs to a file
- Format log messages differently
- Filter or transform log messages
- Route different log levels to different destinations
The transport object should implement handlers for the log levels you want to customize. Each handler receives the log message as a parameter.
For single transport you can use the transport parameter. For example:
For multiple transports you can use the transports parameter. For example:
Version History
The version history tracks changes, improvements, and bug fixes in each version. For a full history, see the CHANGELOG.md.
Development and Testing
-
Set development environment
- Run test cases
Contributing
Please go through our contributing guidelines
Code of Conduct
License
Copyright 2024-2025 Wingify Software Pvt. Ltd.
All versions of vwo-fme-php-sdk with dependencies
guzzlehttp/guzzle Version ^6.0 || ^7.8
lastguest/murmurhash Version ^2.1.1
vwo/vwo-fme-sdk-e2e-test-settings-n-cases Version ^1.2.4